$$(8,3)Y(2,6)$$
$21,58$
$$\frac{\mathrm{d}}{\mathrm{d}Y}(21,58Y)$$
$$21,58Y^{1-1}$$
$$21,58Y^{0}$$
$$21,58\times 1$$
$$21,58$$
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$\frac{1079Y}{50}$
$$21,58Y$$